chore: export all demo activities and group the activities in main screen (#768)

* chore(demo): Export all sample activities

Updated the `AndroidManifest.xml` in the `maps-app` sample to set `android:exported="true"` for all sample activities. This change allows each activity to be launched directly, simplifying demonstration and testing.

* feat(maps-app): Group demo activities on main screen

To make the main screen less cluttered and easier to navigate, the demo activities have been grouped into a list. This provides a cleaner and more organized user experience.

This change also pulls in Material 3.

* feat(maps-app): Use Material 3 Scaffold

This commit updates the main screen to use a Material 3 Scaffold, providing a more modern and consistent layout. The TopAppBar has also been updated to be center-aligned.

* refactor(demo): Extract strings and refactor list composables

Refactored the demo list screen to support internationalization by extracting all hardcoded strings into `strings.xml`. The `Activity` and `ActivityGroup` data classes were updated to use `@StringRes` integer IDs instead of `String` literals.

Additionally, the `DemoList` composable has been broken down into smaller, more focused composables (`GroupHeaderItem` and `DemoActivityItem`) to improve readability and maintainability.

* chore(demo): Add copyright header to Demo.kt and clean up unused import

* docs: Improve comment for expanded group state in DemoList

Author: dkhawk

gradle/libs.versions.toml

@@ -16,6 +16,7 @@ kotlinxCoroutines = "1.10.2"
 leakcanaryAndroid = "2.14"
 mapsecrets = "2.0.1"
 mapsktx = "5.2.0"
+material3 = "1.3.2"
 org-jacoco-core = "0.8.13"
 screenshot = "0.0.1-alpha11"
 constraintlayout = "2.2.1"
@@ -29,6 +30,7 @@ androidx-compose-activity = { module = "androidx.activity:activity-compose", ver
 androidx-compose-bom = { module = "androidx.compose:compose-bom", version.ref = "compose-bom" }
 androidx-compose-foundation = { module = "androidx.compose.foundation:foundation" }
 androidx-compose-material = { module = "androidx.compose.material:material" }
+androidx-compose-material3 = { module = "androidx.compose.material3:material3", version.ref = "material3" }
 androidx-compose-ui = { module = "androidx.compose.ui:ui" }
 androidx-compose-ui-preview-tooling = { module = "androidx.compose.ui:ui-tooling-preview" }
 androidx-compose-ui-tooling = { module = "androidx.compose.ui:ui-tooling" }

maps-app/build.gradle.kts

@@ -62,6 +62,7 @@ dependencies {
     implementation(libs.androidx.compose.activity)
     implementation(libs.androidx.compose.foundation)
     implementation(libs.androidx.compose.material)
+    implementation(libs.androidx.compose.material3)
     implementation(libs.kotlin)
     implementation(libs.kotlinx.coroutines.android)
     implementation(libs.androidx.compose.ui.preview.tooling)
@@ -71,7 +72,6 @@ dependencies {
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.leakcanary.android)
 
-
     androidTestImplementation(platform(libs.androidx.compose.bom))
     androidTestImplementation(libs.androidx.test.core)
     androidTestImplementation(libs.androidx.test.rules)

maps-app/src/main/AndroidManifest.xml

@@ -39,57 +39,67 @@
         <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
     </activity>
+
+    <!--
+      All activities in this sample are exported. This is for demonstration
+      purposes, to make it easy to launch each sample activity directly.
+
+      In a real-world application, you should carefully consider which activities
+      to export. In most cases, only the main launcher activity should be exported.
+      Exporting an activity means that any other app on the device can launch it.
+    -->
+    
     <activity
         android:name=".BasicMapActivity"
-        android:exported="false" />
+        android:exported="true" />
     <activity
         android:name=".markerexamples.AdvancedMarkersActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".MapInColumnActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".MapsInLazyColumnActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.MarkerClusteringActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".LocationTrackingActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".ScaleBarActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".StreetViewActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".CustomControlsActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".AccessibilityActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".RecompositionActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".FragmentDemoActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.markerdragevents.MarkerDragEventsActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.markerscollection.MarkersCollectionActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.syncingdraggablemarkerwithdatamodel.SyncingDraggableMarkerWithDataModelActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.updatingnodragmarkerwithdatamodel.UpdatingNoDragMarkerWithDataModelActivity"
-        android:exported="false"/>
+        android:exported="true"/>
     <activity
         android:name=".markerexamples.draggablemarkerscollectionwithpolygon.DraggableMarkersCollectionWithPolygonActivity"
-        android:exported="false"/>
+        android:exported="true"/>
 
     <!-- Used by createComponentActivity() for unit testing -->
     <activity android:name="androidx.activity.ComponentActivity" />